Stevenson.] ^ OKi [Aug. r>, 



by high hills and the valley is so narrow in many places that the benches 

 are necessarily very indistinct. It is sufficiently clear, however, that the 

 bench, on which Uniontown is built, is the same with the third of the 

 Stewartstown scries as exposed at Brownsville. The transported fragments 

 were seen on Redstone at five or six miles from the river, where the bench 

 is fairly well defined. Further up, the same bench is imperfectly shown at 

 Upper Middletown. 



Along the road leading from Uniontown to Connellsville, the eighth 

 bench is reached very soon after leaving the National road, and it is ex- 

 posed again near Lemont furnace at four miles from Uniontown, where the 

 sixth bench is handsomely preserved at 90 feet below it. The latter bench 

 shows changes in level as insignificant as those of the former. 



The eighth bench is persistent throughout the whole of the Redstone 

 valley east from Brush Ridge, but it becomes a little obscure near the sum- 

 mit dividing the waters of Redstone from those of Dunbar creek. There 

 a higher bench was seen, which belongs between the ninth and tenth of 

 the Stewartstown column. 



On the old Pittsburgh road leading north from Uniontown, the eighth 

 bench is well shown, and, at the first summit, the tenth bench is reached. 

 This seems to be the most extensive plain along the east side of Brush 

 Ridge. 



Benches' along the National Road. 



Between Uniontown and the Monongahela River. The National road be - 

 tween Uniontown in Fayette county and Washington in Washington 

 county seems to have been laid out with the view of crossing the summit 

 of every high hill between the two boroughs. It affords excellent oppor- 

 tunity for the study of the higher benches with the least possible expendi- 

 ture of labor. 



The eighth bench is soon reached west from Uniontown, and a persistent 

 floor representing the seventh bench is shown at 50 feet below it. The 

 tenth bench is seen at three miles west from Uniontown ; and a rude sur- 

 vey of the surrounding country, made with the level, shows that bench to 

 be very widely persistent and to be the important plain of Brush Ridge. 



The ninth bench is reached on the hill holding the eastern outcrop of the 

 Pittsburgh coal bed at five miles west from Uniontown. At that place one 

 comes to the benches of Dunlop's creek, and the ninth bench is seen to be 

 constantly distinct along that stream during its passage through the arch 

 of the Saltsburg axis. 



On the hill beyond the old hotel at nearly nine miles west from Union- 

 town, a higher bench is reached, which is shown in several hills in the 

 vicinity, all of them flat-topped. These truncated cones mark an eleventh 

 bench, whose altitude is 60 feet greater than that of the tenth, or 1350 feet 

 above mean tide. 



The tenth bench is reached again at a little way further west, and thence 

 for a considerable distance the road runs on the ninth which is handsomely 

 defined. 



